I'm fortunate to live where there are so many cyclists that drivers are generally well mannered and overtake safely. (Where I grew up - that was a different matter. I worry for anyone who rides there). But even here, people overtake on blind curves instead of waiting 5 seconds for the straight stretch. And they overtake as if you're a statue, not a moving vehicle - they don't speed up much, and they cut in too soon. I have sometimes been able to get drivers to wait by holding my left hand out to the side, palm facing them, and then when the road is clear motioning them to pass.
A couple years back I started using a flashing red tail light, which might or might not help - nobody ran me down before I got it either!
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"Don't take life so serious-it ain't nohow permanent."
"Everybody's gotta be somewhere." - Eccles